Before you replace the battery, just clean the corrosion off the terminals and recharge it. The battery itself may be fine. Unhook the terminals, clean with water and baking soda, dry and reattach. I spray a little clear spraypaint over the newly cleaned terminals, or smear a little grease over them, helps keep corrosion from recurring. Then put the battery on a battery charger for at least 6 hours. Then see if your truck will start. 2 months is a long time for a vehicle to sit without being started. Batteries discharge on their own, clocks and electronic memories take a small amount of current, and especially alarm systems. You ought to start and run your vehicle at least an hour every two weeks to a month, or at least keep a battery maintainer or trickle charger on the battery when not in use.

Hi i have a FORD EXPLORER 4L V6 1997 i it dont want to start we check the fuel pump and spark plugs and thats fine when you start it back fires by the part where the air filter is can it be a valve or...

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